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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8bf89539a7ad9c86510f7387e34dac09c8fb3838ba82b8bd1f53ac55ecbd04' 
  AND token = 'vMaj82bfw5Z2IahbjjJUxtnBA98tW31BrZ0/E33ojJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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