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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b84a62701a04154d3b06b7da3635d94d0165876067c9358f9bd7089ae49a375' 
  AND token = 'OkTXO9OezwvnV0R7qS4Fy3llIq1p8aTMtUnTAyQUPs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00185

JSON explain

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