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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43f8fc38f9114560f289fa8df2414070cdbd23d3c303b419b5f4d087f178d3e' 
  AND token = 'culujgNPH86mJyLAlo9iNpCfyDrbYqV8Z5VJFQD+TC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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