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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97a2a0c981291a6101966e10fb9b4ae25457a55e3c8d889d9cd3532bf7b7309' 
  AND token = 'Oss61aWgZDLkzLU3gAGvRcxBf/ZNQR9/nex3Gup9F90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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