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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4508fd1fcab00506f9b595a53415a5432ce28f8cdfbe64181957ee54fe5fb3' 
  AND token = 'w5RIbBMSD7Tg7IClQqsN6/YjKa6v2kTqvBw2A6+aDEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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