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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa37da53a7c2403ee6527add9da05e5debfac91ab5f72c32c879a80e0c0bdb9a' 
  AND token = 'AfWxPBJrT1qmVKbx+p+8CpqCWjEL5jaHONofGchW+jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}