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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8442b59861c9b2e9e96e61f66486f95b5e04c71610b3e58fbac3132300beab9' 
  AND token = '4BJ9u5smrI3pa+cdRV63LmyvoTaU3GXHl9EPtCMvVQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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