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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2b6efc242a75d8936e12db83171b414d2705f32d59f564619a20ead72bfd24' 
  AND token = 'y4zarFIMDFnr9+pZGy/cilELx0Xu7tfi/EFoHuj/amo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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