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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eccbe59fc343dae7e288f9a2307545dfe55b35f15c67d7d6a83fd3a59c31071' 
  AND token = 'ahc7sIMRhFRqc4Hhca8+xogDc0DVEihyM3SSiUpNPFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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