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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12ee439b8edf3388eb79ef62436f7047de27a8ee77e613ac001f9ac4c7ec49a' 
  AND token = 'XKjyVfEpj88MYtKBZXi2bBCXUTQKsQjmp25qBiUneiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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