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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada4fa9eeaa5de1f5ad7576140c9556f93877ae46780afb826f7f243502943b7' 
  AND token = '3aWUHlD62Chyslw/CsWyj2NEX/RjSBB9C7a2byAOGd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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