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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a21d7e9237bb85f9c579a7a5b1d2fe7c538983219a73c0ade23c8be7929fc7' 
  AND token = 'aXPoCHW7w+fhAWIB5P8MZha3X5rdxqo6W+kqn25ji4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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