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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8adaaf5732af8e0365e3eecac6e701544f118b93497b4e76932527d129ef8f33' 
  AND token = 'BPY0KJBb5Ls1HWMxbp6ZQ/eRN52L70hCPNXKAoseDRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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