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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64252e1a3bd6b066011b02b6413719d5ba885e8500260722add35685a2dd3cb' 
  AND token = 'plk1PauPXE04U+ekY/4eamcJeLWESVtV8Y88TGDJGXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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