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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd18a286186831b25158caa426e91d853e28113e65a13911d28e06b0e9fd996' 
  AND token = '19qR1rDsqo1fuBRqcBmXlw5mhOGYlSqTF8cfxB6WTkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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