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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d74d6d669fb38bc966465b25e21124ac2a72ffd21ce8775e88e53c8adb047f' 
  AND token = 'Xl7VDIqgCLQoE5nc743QcgujQSQMpsqC8HF6yfdiwmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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