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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1d12b255a76a53a37bed5b4981f531430a56ced591295e06a061d6e0c5e752' 
  AND token = 'xWPFnJtRPBHElgphIGdmTaco/2hyamJBSHST0CeQhpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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