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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f282d36487bcef3899f358d944d038a59648daac73e48ad0be42d62398006d' 
  AND token = 'xIfEF9AfSWXxt7rOSLefWtVBct6W8BuUXp0itqQm6fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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