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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24c96bb126e29af9ef0a4f4da2aedc45152aa0d178961b912d295866390c1e5' 
  AND token = 'TobTWcxgu+hBVUl92CI1UQ8vp4ZueKr1bEtSsGLxw/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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