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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e538b7aa34b6b006e2236b524a7d98dde45aaf32a9f8d1584a4a8c3ab3175b9' 
  AND token = '89euWMcvsfu60xyfX/8FXbauergbFNadljqbBfl0sQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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