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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba64237476cde8ba430d8f84d9e320ba82c424902d18253c176474d3e384c1a6' 
  AND token = 'pvLGlS4IdAQJdozOJkZZcA2pMA2+Ugsjtm7Ghh5WZto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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