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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4917e26ecbc8a0377ccf7ec57a8a286dfdb9ec7b6b69d4e415d2f08f5ba52d18' 
  AND token = 'frxwUj13k0bxNGUdE6adguQDw+xx5/vXOWJGcJ3mm0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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