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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd870e40a1a3923337e5bd57a757c838da1f78584860471287c74481daf3afe' 
  AND token = 'BRpekvMzSQU9919X+twpP6HgCLgkS6UCzjCk4PXkHPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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