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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e7fc6b6074d2a08ba98a5f5997e4b401253decd491790013fd96bc4dc6c61c' 
  AND token = 'G/Set2wU4hGFcTRxcpbcy+2g0z+NTG7wF9cHXOK1dJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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