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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19789dfdc98b688d5144bd363e31799acf1f601108365f645b2cbebe05bf4197' 
  AND token = 'NWHVQvgvDIA+oXTpx3qFXze0zqYSx3AZC6q3Tkiltnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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