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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a236bf748929c5d60f5db4bb34e396cd2ead91f5dbe4df4a07e5882bf7a1cd4c' 
  AND token = 'snPHqU9g9lKe42i489NXB9jDsaaqaNIEjXe0eq+Hsoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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