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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf8d20259626489e949a17179b200508f10fe70b52cb5fb8f60f1921e295c8c' 
  AND token = 'Ejpdul96tux3F54tKXVhzcAIBb+4mMEM0VDaSJMfyO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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