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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d5346e9fb249d870ee837afb85b10b75ec8fa81568b839f172ce5cf1ef808b' 
  AND token = 'u6mfmMp8df5Gd/kuvmm90bw7u8PZkj/7uXNElN52u+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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