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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0386e1a95853e486bcbaf6c5c2a82d5e2649825e3dca2f1c6419a1f7de27ef71' 
  AND token = '70+ttrXI1dQXEsfP6/5gmUriTSZJrAEyHpHYtL+lGEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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