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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55725894026b2e615569c58ed0de4fcfd1faa2d794011ccfa66fd492cb2c763' 
  AND token = 'En6GHdiPAo0VFW6OglaDECnMKNidVh1QSZ7fAwrXITk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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