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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7510fe126753944f5927a2b1a1e38071515e1b1c6d05703ffbb44aebda5867ba' 
  AND token = 'J8+EzepLPhisl4D1jZ6g/pbsLrnUKs6qxr3TS0mEtaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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