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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9f0f052d27b5df74eba071abe6aec105c7d4683d7f777f773819213a3ef245' 
  AND token = 'w8uzqyS5eZn8p1UOQzTr+aMl9wk1dgUmYtTTKxgTG+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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