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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0d148ade1b500ac6c36cf933a527917f6b8eacfa124670e8cae75d12d0e1b1' 
  AND token = 'fjWmaSKNTbpWKZGXLSyJip+cAliBSED9U9kOFnJZ60E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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