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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fadaa5c0195023fff6d63485ae4d9548ebd9812a7096ec03d5c8e4d68a20f70a' 
  AND token = 'oQsSRWarijL/al7A76hESfwSCX0vFDN+jZ0uipzIzx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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