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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8a435ef24098f321e7c0c123dd38199e294dd098ade24f4ca3c1008203c0b7' 
  AND token = '4juoNaFG3/qKsSHg9fut9x9hGNssxiD6SjYoXYWQpZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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