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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca9dee61f00e6ef2849341005df5ad34c3df4cf7f2a47a0ab99c02ed75b5869' 
  AND token = 'AKrcoILri77fUjGou93nRgqjfzENKrIE4XLwhe5qMjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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