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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d19a2633cc6249027e8ff6998452e8e0e7550cf1870d209e29ce95f895ef43' 
  AND token = 'BkiQAuL2v7SkldwbTF9I9KNK+wH3ZZ0urFRNgcLBxUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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