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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a6d0334299b1e7756d84f39197aeb5ee668f8fd1cec64e75377d33f9181d54' 
  AND token = 'obJkn3rORbWsFQTkK7LVUjMkeVaLDbJoOYB6IPLDGIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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