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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8402ba3a1d46b16db7d0c3f4fabe063e3ef3d920d27c4f49e7ebeb6d7aab66c' 
  AND token = 'cmjZ0Vbb7QwnsXmPxrus9mzLSSLN8HNaxsILmZxaS/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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