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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a026946159a8a1b3c3168fa7650a1672cd98067442391aa20c5a383fd6991f' 
  AND token = 'kj1lUN+a0wpg8wE8ZuAJRF6aMU0TGgvT7JD+/Vqtr7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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