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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2476f85e6a8604f9782eb933fce6438101d8f93aa765c5ad676a31b56f4c7a40' 
  AND token = 'pexsLCqHAo6AomobGpXa3itbSld5Q7uvtTNiFYVFcwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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