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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc68c9606a691c3a5ed6bc98e2ec116b3c6ee53d8135aa97c97cf0f2198b5e6f' 
  AND token = 'bf2qDR/F7OwYYYR3pYv/ea7GrZPqMl+0ZMrIS0yQi4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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