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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb8f17baf53725f2b1c0b501b0aba92f2951a095d0e5e782d1f3d8ab4d7cb62' 
  AND token = 'gL1eyAkO6e7G0EdZpd6rJxPIu6VJ1ZVxSz9s1JVgKyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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