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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32e7175c8cd3cc4ab4ce44cb24cb0bc4da9fa596f325cbb4fd4dbcf7c6059ad' 
  AND token = 'Hf8SCRRpPcQQ4raXvILFnVOmvAfUkJ5Zi7s0/j6Nj9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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