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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c0aad2dd6d29292094d9969e9e9fcee198be7f46ace73ba9820f844d7c3ea4' 
  AND token = 'yu9bGdu3/fMghbqShX14QuoTi955OD90wPVBiLlGoAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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