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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c927a1eec52f9c965cc509e479461208855ee8d5d67e087b8af40c0cd9f3abb4' 
  AND token = '72ODcGDnG259CiNHRoQBz8SYOeu86VCxg1XHJMBBlDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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