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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af88e27ef2aac95b09a480bd359a678a0da4a8d2298bb96ac61eb9ee62ff8c0c' 
  AND token = 'qa1Nez1lnQ3g9JHQJeKeI0Vx6friFsN3YZQ1Aczd1Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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