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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c14c092e02b059c8e9b998bfb65365eae85acf88e7ef5f53648ff9ede5bd859' 
  AND token = 'daX31XAcAKFQPOO7jqXsk220bJ1Q7cuPdbJ3L5ytS1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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