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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1d5ed739765d2293dd594eb29e44fddd9bc0c04b7a6ee49b1a0e556525ccc7' 
  AND token = '14Mjowqb6y6jJ1jc2bptGtjp4/qEfxQkwygb06mk9JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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