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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c594b6dd7149d4b18dfc710420b2dfcb0ed9a676b1af9fc2ff842b2e2cfbd343' 
  AND token = 'HPBPDHYzUCiUeQZvmDC4C2M6HWosDMJZbkdG/0MWCfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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