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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2528ed92b4c9f51e0b4a7cab24f839052e7815ad64006651a75120e5a34dde86' 
  AND token = 'f9Fa3CBC+4YctOXPUYfomFRHp6f+7wuFms42k8Ejw8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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