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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b63a70deb05e4cccd7fbad4fa53717f25fba8921c61c8e7def77d7a5c07cc8d' 
  AND token = 'DHkGQJ7/AIcqvXFjsqNtB2Y538SjBC0FUV1VQ7XZ+mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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