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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4d5a517bdd0e7b4dd909fcd6265fb9efb614d39127860020d1fe83de96e9dd' 
  AND token = 'dtfUaHZhOx8gqDIpXnsD86Lp56bF1ywHi6DqilO6vME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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