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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630254f5ffd0be4f5f8ad40b6a2f074768e3ce6b0490daa3c4647a88655235d5' 
  AND token = 'rLpNsxn/Ir/um6ApiXO7xajrT+7bQ023rV+29jXAfFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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