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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df69af91c7324ea69158672e3c521da88d6b6e0e33d2aba243200dcbe7f02b9a' 
  AND token = 'k1Hbc6MrMsfqiBJ8Fcm2CoSdHI0F1yFqaTIzC9tCPzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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