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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0967242ccb45dd26d99835f1498d00e0306c489120327006594ff6d0dc116680' 
  AND token = 'iq/Ab/G4mcx1mX9UsxxryT6a9w3pw5/1/UfV76secZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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