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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb496c9506a3fd7cafb9ecb6a9095f719d7d18d5a531bbebe10ca50cf33c3425' 
  AND token = 'RP56tq7O6z2hWnWLGeJywoZ14jozJ0VxChxEdetdtqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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