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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311bf91dca66cf9cd553bacecc612befc3773a0f972c8c109e1dedd2d5a71cd5' 
  AND token = 'H+b2jOM8tsnVg2o2WGkHugt1jRBl4Tb8JRpzrdWI2QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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