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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdb1aa6082c7d9e273981a5156d9c2e5f9d90ec44912d15ff1ed3ea5d11be98' 
  AND token = 'Msetk4gL3+WYikcK4Z6z+NZ0r6wUHX7OAKbrO5Jug0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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