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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbd073a0b54d4eaa13ee89dbbe7d2f99b211dc3baaf32932ebc7f09f5ff7d10' 
  AND token = '+/Cdgcb+y6/A8OTSXqKG5eEtkqYRZP+yRFYUc7R5vZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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