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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a57d04caca1d1afbe4a7f618a04ef070402125fa08fd583ea9e4b8e7237c230' 
  AND token = 'wbt1fZQgrJRuOw1qp+4QeWQJfy3i49MOaPZEtKkmbOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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