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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f117ae2d701b9cb81fd5c07c94ab611b91e4b2af7b7401e836696ff55f44b6' 
  AND token = 'GJzH/ZuOtIaUdJrdhop4CvmTWljW/TzWDW91iROIcNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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