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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993b1dd67b705311d1543118c60cf1d9161398c0332c3c601f7a484fbad3cbe9' 
  AND token = 'qwe0/lOC1Nz1JcxvRTtZDTD2gnpHfUTae+PIfQcv63I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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