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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8b62b3a57af04975f64e34a6b2b87065e9252710b967a98bd151b67ee195e6' 
  AND token = 'Ytr+NbPHjSOM0P9JEmCk+mBlVO+BxpVMUJd3SgDCsn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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