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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5e1039f998da0f6fd59abe51f0e9817b1056946abfcd38c6d33a9939037d89' 
  AND token = 'ki7XdgRZZF1QBpwdCkrQ0J7NqphAaX/xJFC6LihQsu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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