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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7199eb540e73c176cae88bef9faaae1a85125d7337fbce078705d08840288f' 
  AND token = 'JQE4sR2m2N2Bvn9lQ70HR1IZdcCe7NMEBaQn1TSGZX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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