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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75205698a6fc30ab482e897e549b505f9579c216afcdd9fc39d47dd21923b394' 
  AND token = '0ySv/v8g55X1rU+aAkhMSRxLnlDmFUkXhjXCIrDaniE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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